Actors are a key component of Use case analysis: a technique for gathering requirements for technology system design. Use cases model business requirements by describing in simple, non-technical language how the system will be used. This approach defines:

1. Actors: represent a role played by one or more persons or outside systems
2. Use case: illustrates a required system function under certain scenarios or events
3. System boundary: divides functions and operations included inside the system from those provided by external resources

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